Need of Knowing Fiber Non-linear Coefficient in Optical Networks

This paper describes the need of knowing fiber non-linear coefficient in global optical networks. The basic Kerr non-linearities that appear in silica-based optical fibers have been summarized, together with their implications for optical communication systems. In this paper, the non-linear coefficient has been discussed and its measurement techniques reviewed. The brief description of each method is given. This paper focuses on the comparison of different interferometric and non-interferometric measurement schemes in terms of their simplicity and versatility of testing various types of fibers. Accurate determination of fiber non-linearities is an important issue in the design of optical systems. Key-Words: optical fiber, fiber non-linearities, fiber measurements, non-linear coefficient, self-phase modulation, modulation instability, cross-phase modulation, four-wave mixing